Name of this topic is the question itself:
There is still one novel missing form promised KS rewards, and for example, on GOG is still listed as "Coming soon", which should have been written by Chris Avellone.
I remember one interview a year or so ago, where he was approached and asked about it and he said it still being worked on (sic.).

So, will be the last novel released or not?

Because, honestly, I don´t expect it will, although I would read it, just like those other three.

We don't stop playing because we grow old; we grow old because we stop playing (George Bernard Shaw)

** It's worth mentioning that in his Ouroboros novel, the names Demon, Witch, Goblin, and the like are not actually fantasy races; they are just people. The names are of their country/region; Witch/Witchland, Demon/Demonland. Like Greek/Greece.